<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="../vue.js"></script>
</head>
<body>
    <div id="app-5">
        <p>{{ message }}</p>
        <button v-on:click="reverseMessage">反转消息</button>
        <!-- v-on后接行为method，如click -->
    </div>

    <script src="./vue.js"></script>
</body>
</html>